The cache can be rebuilt and it's already happening
All it takes is a bit of the jolly roger spirit - grit, and being willing to work a bit and share that work with everyone. Source content and pack your own torrents. Make sure the torrent and file names contain no problematic keywords. I'd recommend little more than the title (both the native and English name if applicable), the year, and maybe barebones info about the quality (I have tested that e.g. 1080p works fine). Paste your magnet into RD and seed it.
Not only will this make the content available to you for instant streaming, but for everyone.
Sure, you could just give up and move elsewhere, but there's no guarantee that the same thing won't happen to them. Plus we know that RD still has the infrastructure in place to bear the load, something that can't be said for competitors that have billed themselves as a lifeboat only to sputter many times under the load from poaching RD users.